Tool-holder.



No. 639,428. Patented Dec. l9, I899.

J. M. NDRMAND & D. B. HYDE.

T 0 0 L H 0 L D E R (Application filed Feb. 27, 1899.)

(No Model.)

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JOSEPH M. N ORMAND AND DAVID B. HYDE, OF SPRINGFIELD, OHIO, AS-

SIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO THE WESTERN MANUFACTURING CO., OF SAME PLACE.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 639,428, dated December 19, 1899. Application filed February 27,1899. Serial No. 706,971. (No model.)

To (all whom it may concern;

Be it known that we, JosnPH M. NORMAND and DAVID B. HYDE, citizens of the United States, residing at Springfield, in the county of Clark and State of Ohio, have in vented certain new and useful Improvements in Tool- Holders, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in cutting-tool holders for lathes in which the cutting-tool is adjustable up and down independent of the toolholder.

The object of this invention is to so construct the forward end of the holder that the cutting-tool may be brought in line orslightly below the uppersurface of said holder,whercby the vibrations or chattering, as it is sometimes termed, is greatly lessened or practically avoided.

Another object of this invention is to provide an improved clamp having a lip projecting from its upper edge to engage with the upper edge of the holder, together with a toothed portion for engaging with the cuttingtool to insure such tool being held in adjusted positions, also having aprojecting rear portion, which acts as a fulcrum for causing a greater pressure to be brought to bear upon the tool to hold it in position by means of a clamping-screw.

Our invention relates to details of construction hereinafter appearing and particularly pointed out in the claims.

In the accompanying drawings, on which like reference characters indicate correspondin g parts, Figure 1 is a side elevation of a toolholder, showing our improved clamp and cutting-tool attached thereto; Fig. 2,a plan view of the same; Fig. 3, a sectional view on the line a- 00 of Fig. 1 looking in the direction of the arrows; Fig. 4, a front end elevation; Fig. 5, a detail perspective view, partly broken away, of the holder proper; Fig. 6, an enlarged detail view of our improved clamp.

The letterA represents a tool-holder proper adapted to be used in connection with lathes, particularly lathes for turning metals. It will be observed that the upper surface near the forward end of said holder is cut down,

as shown at B. This cut-down portion is for the purpose of receiving a lip or projection C from our improved clamp D, the upper surface of theclamp when in position being preferably flush with the upper surface of the holder. It will be observed that the outer end of this holder is beveled downward and outward, as shown at E, and fromsuch outer point is beveled inward, as shown at F. The clamping-plate D is also similarly beveled, so that when the plate is in position on the holder the corresponding bevels match with each other. On the inner side and at the inner end of the clamping-plate it will be observed that there is a raised portion or projection ,as shown at G. This is for the purpose of permitting the clamping-plate to fulcrum about the projection, and consequently when the screw H is screwed into the hole a in the clamping-plate it will cause the plate to grip the cutting-tool I much more firmly, as the gripping action is brought to bear directly on the tool. It will be observed that the gripping-plate is notched or serrated, as shown at J, within the toolchannel K, it being understood that one-half of the tool-channel is formed in the clamping-plate, while the other half is formed in the tool-holder proper, as clearly shown in Fig. 5. The cutting-tool has one of its corners notched, as shown at L, for the purpose of matching the corrugated or notched surfacein the clamping-plate. Thus no mattcr what the pressure may be upon the cuttingtool due to its action upon the metal it will retain its relative position in the clamping plate. It will th us be seen that there is a constant tendency to cause the clamping-plate to change its relative position with respect to the holder; but this we have overcome by means of the projection or lip C, above described. Thus no matter whether the interior face of the clamping-plate is in contact with the holder or not it can never change its position with respect to said holder while the cuttingtool is operating, and much of the strain upon the bolt or screw H is relieved. It will also be seen that in our invention we have provided not only for the greater lateral gripping of the tool within the tool-channel, but we have also provided means for holding the clamping-plate against vertical movement relatively to the holder itself. The result of this is that the tool is kept in its exact set position with respect to the work being operated upon. This is of great practical importance, because when the tool is once set it is set for good, and there is no variation in its set position.

By reason of the bevel's on the end of the tool-holder the cutting point or edge of the cutting-tool may be set much closer to its support and still properly operate upon the metal. Thus we have provided for not only holding the cutting tool in its exact set position, but with our construction we have overcome much of the vibration or chattering between the metal being operated upon and the cuttingtool, due to the fact that the cutting edge of the cutting-tool may be brought much closer to the holder. This enables us to produce or turn out much smoother and regular work.

In the illustration we have shown the cutting-tool as having a diamond-shaped upper face; but it is obvious that suchsh'ape may be varied Without departing from the spirit of our invention.

By referring again to the tool-holder proper, as illustrated in Fig. 5, it will be seen that the tool-channel is notched or serrated, as shown at 2. Where the tool-channel in said holder is notched, the notches or serrations in the gripping-plate may be omitted, while the cutting-tool is notched on its opposite corner to lit such serrations. It will be understood, however, that we prefer to notch the clampingplate.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a tool-holder, the combination with a holder proper, adapted to extend about the forward edge of a cutting-tool, of a clampingplate adapted to be clamped to said holder, and also extend about the forward edge of said cutting-tool, said clamping-plate having a projection or extension adapted to engage with the holder proper to prevent relative movement between them, said clamping-plate adapted to grip or hold the cutting-tool, substantially as shown and described.

2. In a tool'holder, a clamp having a channel or groove therein, with notches or serrations in said channel, a fulcrum portion along the rear edge on its inner face, a lip or projec tion extending from its upper edge, said clamp also having a screw-threaded opening therein, substantially as shown and described.

In testimony whereof we aflix our signatures in presence of two witnesses.

JOSEPH M. NORMAND. DAVID B. HYDE.

\Vitnesses:

B. BLACKBURN ESTERLINE, A. O. SLAGLE. 

